I could use any of those mentioned so far, but until I own my own rifle, I'd have to borrow my daughter's Mark X, .243 win. I haven't developed a varmit round combo for this rifle as of yet, but it will come in time.
I'm saving to purchase a Mini-Mauser in .223. For Xmas Santa Claus is bring my daughter dies and bullets for her 25-06, 85 grain Ballistic Tips, so she'll have a varmit load worked up for that one.